Datasheet

• Bits 29:27 - SFEC[2:0]: Standard Filter Element Configuration
All enabled filter elements are used for acceptance filtering of standard frames. Acceptance filtering
stops at the first matching enabled filter element or when the end of the filter list is reached. If SFEC
= “100”, “101”, or “110” a match sets interrupt flag IR.HPM and, if enabled, an interrupt is generated.
In this case register HPMS is updated with the status of the priority match.
Table 39-14. Standard Filter Element Configuration
Value Name Description
0x0 DISABLE Disable filter element
0x1 STF0M Store in Rx FIFO 0 if filter matches
0x2 STF1M Store in Rx FIFO 1 if filter matches
0x3 REJECT Reject ID if filter matches
0x4 PRIORITY Set priority if filter matches.
0x5 PRIF0M Set priority and store in FIFO 0 if filter matches.
0x6 PRIF1M Set priority and store in FIFO 1 if filter matches.
0x7 STRXBUF Store into Rx Buffer or as debug message, configuration of SFT[1:0] ignored.
• Bits 26:16 - SFID1[10:0]: Standard Filter ID 1
First ID of standard ID filter element.
When filtering for Rx Buffers or for debug messages this field defines the ID of a standard mesage to
be stored. The received identifiers must match exactly, no masking mechanism is used.
• Bits 15:11 - Reserved
• Bits 10:0 - SFID2[10:0]: Standard Filter ID 2
This bit field has a different meaning depending on the configuration of SFEC.
1. SFEC = “001” ... “110”: Second ID of standard ID filter element.
2. SFEC = “111”: Filter for Rx Buffers or for debug messages.
SFID2[10:9] decides whether the received message is stored into an Rx Buffer or treated as
message A, B, or C of the debug message sequence.
00 = Store message into an Rx Buffer
01 = Debug Message A
10 = Debug Message B
11 = Debug Message C
SFID2[8:6] is used to control the filter event pins at the Extension Interface. A ‘1’ at the respective bit
position enables generation of a pulse at the related filter event pin with the duration of one
CLK_CAN_APB period in case the filter matches.
SFID2[5:0] defines the offset to the Rx Buffer Start Address RXBC.RBSA for storage of a matching
message.
39.9.6 Extended Message ID Filter Element
Up to 64 filter elements can be configured for 29-bit extended IDs. When accessing an Extended
Message ID Filter element, its address is the Filter List Extended Start Address XIDFC.FLESA plus two
times the index of the filter element (0…63).
SAM D5x/E5x Family Data Sheet
CAN - Control Area Network
© 2019 Microchip Technology Inc.
Datasheet
DS60001507E-page 1308